docs(jangar): finalize control plane rollout evidence

[gregkonush]

Summary

• Adds the post-chore(jangar): promote image 919848c1 #5538 Jangar rollout evidence to the 2026-05-05 control-plane release audit.
• Records the successful jangar-post-deploy-verify / verify run for merge commit e7b852102.
• Updates the live pod evidence to tag 919848c1 digest sha256:8651851a0b5baef46b9a10f933a56473313f3028658d41e1b68a73289cc9fd57.
• Updates rollback guidance so the first rollback target is the previous healthy a1b55322 image.

Related Issues

None.

Testing

• bunx oxfmt --check docs/agents/rollouts/2026-05-05-jangar-control-plane-verify.md - pass
• git diff --check - pass
• gh api repos/proompteng/lab/commits/e7b8521021ef0d350825c39bd71b93c876234f5a/check-runs --jq '.check_runs[] | [.name, .status, .conclusion, .completed_at] | @tsv' - pass/skipped only for lint, validate, and verify
• gh run view 25396138259 -R proompteng/lab --json status,conclusion,createdAt,updatedAt,jobs,url,workflowName,headSha - jangar-post-deploy-verify / verify completed successfully
• kubectl get pod -n jangar jangar-847d6d7f8d-zx5sq -o jsonpath=... - pod Running, Ready, app restarts 0, live image digest matches chore(jangar): promote image 919848c1 #5538
• curl -fsS http://jangar.jangar.svc.cluster.local/health - returned ok
• kubectl logs -n jangar pod/jangar-847d6d7f8d-zx5sq -c app --tail=80 - startup log showed leader election and Jangar listening on port 8080

Screenshots (if applicable)

N/A.

Breaking Changes

None.

Checklist

• Testing section documents the exact validation performed (or N/A with justification).
• Screenshots and Breaking Changes sections are handled appropriately (removed or filled in).
• Documentation, release notes, and follow-ups are updated or tracked.

[gregkonush]

Status: merged at 2026-05-05T19:08:18Z as squash commit 26890c32.

• docs(jangar): finalize control plane rollout evidence #5540 PR checks were pass/skipped only: semantic title, semantic commits, and the deploy-automerge enable checks skipped as expected for this docs-only follow-up.
• The merged audit now records chore(jangar): promote image 919848c1 #5538 rollout evidence: jangar-post-deploy-verify / verify passed at 2026-05-05T19:01:19Z, live pod jangar-847d6d7f8d-zx5sq is 2/2 Running, app restarts are 0, /health returns ok, and the app image ID matches digest sha256:8651851a0b5baef46b9a10f933a56473313f3028658d41e1b68a73289cc9fd57.
• feat(jangar): surface failure-domain lease holdbacks #5454 remains no-go: clean branch and green checks, but the mandatory >1,000-line Codex review is absent because review requests returned usage-limit errors.

Final gate: merged Jangar rollout is healthy; next release action is Codex review capacity or explicit maintainer waiver for #5454.